Need help 03 expo 4.6 high idle

[gforceman]

ok , engine was running the hose going to the IAC fell off causing engine to race reconnected the hose now the idle wont go below 1500 rpm, i checked the IAC valve and its good with a meter and 12volts , the wire conneted to the IAC shows 12v even when engine hot , thought that was used when motor was cold .

also : as for the IAC vavle i removed it to inspect it , i was ablr to move the soleniod freely , before i reinstalled the valve i pushed the plunger foward closing off any vacuum from entering the TB ( since engine is already hot ) started motor ran ok idle normal ,, when i reconnect the wire for the IAC the rpm would go up to 1500rpm and stay there maybe drop a little but still high.

so why would rpm go up when reconnecting the wire for the iac since engine is already hot

thx for any input

 

[swetrid]

Sounds like the iac is stuck. You can try cleaning it and tapping on it with something lightly. If the idle goes down I would replace the iac because it will stick again.

 

[gforceman]

i removed it and bench tested it , it pulls in but the internal spring doesnt push it all the way back out leaving it wide open , i thought the vaccume pulls out all the way out slowly , when reconnecting the pwer wire will pull it back out but wont idle also why removing the IAC hose cause this problem it was fine before no problems ,,

 

[swetrid]

You might have a vacuum leak somewhere else or just a coincindence with sticky iac.